Feeding mechanism for sewing machines



M WMMWJW) A. B. CLAYTGN FEEDING MECHANISM FOR SEWING MACHINES Filed Nov. 24, 1925 2 Sheets-Sheet 1 TEE m Oct. 12 1926.

'LfiGZfi-Z? A. B. CLAYTON.

FEEDING MECHANISM FOR SEWING MACHINES Filed Nov. 24, 1925 2 Sheets-Sheet 2 INVENTOR 2 WITNE-FQSQSE'S I v 8Y4 QkAmMwmMm TTORNEY I Patented 0st. 12, 1926.

ANDREW IB. CLAYTON, OF UNION, NEW JERSEY, ASSI GNOR TO THE SINGER MANU- FACTURING COMPANY, OF ELIZABETH, NEW JERSEY, A CORPORATION OF NEW JERSEY.

FEEDING MECHANISM FOR SEWING MACHINES.

Application filed November,

This invention relates to an improvement in differential feeding mechanism for sewing machines and more particularly to differential feeding mechanism of the four-motion type wherein two feed-clogs are commonly given substantially equal rising-andfalling movements and differential feedand-return movements for the purposes of fulling or stretching fabric in advance of the stitching point.

The invention has for its object to provide a simplified and improved construction comprising but few operative parts, capable of quiet and efficient operation at high speed and readily accessible for adjustment or repair.

More specifically, the invention has for its object to provide a simplified differential feeding mechanism in which .both the main and auxiliary feed-dogs have a substantially four-motion movement with both feed-dogs maintaining equal contact with the material during their feeding movement.

' In the present embodiment of the invention the main or rearwardly disposed feeddog and the auxiliary or forwardly disposed feed-dog are carried by feed-bars independently supported and havingoperative connections with feed-rockers disposed respectively upon opposite sides of the sewing machine main-shaft, each of the feed-bars receiving substantial equal rising-and-falling movements from eccentrics on said mainshaft. One of the feed-rockers has a connection with an adjustable eccentric, also on the main-shaft, whereby feed-and-return movements are imparted to its respective feeddog while a connection between the feedrockers communicates similar feed-and-return movements to the otherfeed-dog. The interconnection between the feed-rockers is adjustable whereby the feed-and-return movements of the auxiliary feed-dog may be varied with respect to those of the main feed-dog to insure the desired fulling or stretching ofthe fabric.

In the drawings, Fig. 1 is a plan view of the base of the sewing machine with feeding 24,- 1925. serial m. 71,030.

mechanism, Fig. 2 an end view of the same and Fig. 3 a perspective view of the essential parts of the feeding mechansm.

Inthe preferred embodiment of the invention, as illustrated, the bed 1' ofthe sewing machine is provided with .bearings 2, 2, in which is suitably journaled the main-shaft 3. The machine'is provided with a looper at which cooperates with the needles 5, 5, carried by the needle-bar 6 in a-well-known manner in the formation of stitches. The presser-bar 7 has detachably secured thereon the presser-foot 8.

For feeding the material, I have provided a main feeding mechanism disposed rearvwardly of the sewing machine main-shaft and comprising a feed-dog 9, carried by a feed-bar 10, the rear end of which is pro- 'vided with spaced lugs 11, 11, entered by the supporting pin 12 passing through the spaced bearing bosses 13, 13, on the upper end of the feed-rocker 14: which is provided with depending spaced lugs 15, 15, entered by afulcrum-pin 16 journaled in sleeved bearing lugs 17 of the sewing machine bed 1. Projecting forwardly and downwardly from the feed-bar 10 is an apertured arm 18 affording a socket in which is slidingly fitted the pin 19 projecting laterally from the "strap 20 which embraces the feed-lifting eccentric 21 fixed upon the mainshaft 3. The

feed-rocker 14 is provided with an additional bearing boss 22 entered by a pin 23 the free end of which is engaged by one end of a pitman 24:. The other end of the pitman is provided with a strap .25 embracing the adjustable feed-actuating eccentric 26 on the main-shaft 3. As the shaft 3 rotates, the

main feed-rocker 14 will be oscillated and through its connection with the main feedbar will'cause'the same to move back and forth, thus imparting to the feed-dog its feed-and-returnmovements, while its risingand-falling movements are derived from the eccentric 21. v p

The auxiliary feed is actuated by suitable mechanism disposed forwardly of the sewing machine main-shaft. It comprises a feed-dog 27 carried by a feed-bar 28 pivoted on the supporting pin 29 retained by setscrews 30 in the offset head of the auxiliary feeduoclrer 31. The collar 32 retained on the pin 29 by the screw 33 insures against sidewise displacement of the feed-bar. The fcedroclrer 31 is journaled at its lower end upon the rock-shaft 34 suitably mounted in bearing bosses 35, 35, extending from the sewing machine bed 1. Clamped upon the reduced portion 36 of the auxiliary feedroclrer 31 is the slotted arm 37 adapted to receive a slide-pin 38 upon which is journaled one end of a pitman 39, the other end of which is pivotally mounted upon the supporting pin 12 of the main feed-rocker 14 wherefrom the auxiliary feed-dog receives its feed-andreturn movements.

Secured upon the main-shaft 3 is the auxiliary feed-lift eccentric 40 embraced by the bearing blocks 41, 41, of the forked arm 42 secured'upon one end of the rock-shaft 34 by fastening screws 43. The other end of the rock-shaft has clamped thereon by screws 44 a lift-arm 45 having a link connection 46 with the auxiliary feed-bar 28 from which the latter receives rising-andfalling movements.

Upon reference to Fig. 3 it will be observed that the auxiliary feed-bar 28 and the main feed-bar 10 are independently supported respectively in the front and rear of the sewing machine main-shaft 3 from which they receive their operative movements. This arrangement of the feed-bars is particularly advantageous in that plenty of room is thus. afforded beneath the cloth plate 48 for the respective feed-actuating connections which are maintained Well spaced apart and are consequently easy to assemble, adjust, and repair if necessary. It will be further observed that both feedbars are disposed substantially horizontally beneath the throat-plate 47 their fulcra upon the respective feed-rockers being substantially at the same level and slightly below the level of the throat-plate. The feed bars receive their rising-and-falling movements from mechanism directly beneath the same and the eccentricities of the respective feed-lifting eccentrics 21 and 40 are such that they operate through their respective trains of mechanism to impart substantially equal rising-and-falling movements to the feeddogs which maintain substantially equally timed contacts with the material during their worlcadvancing movements. Further, the horizontal arrangement of the twofeed-bars, which are mounted on fulcra close to the level of the feed-dogs, insures that the work-engaging surface of the feeddogs will depart but little from a horizontal plane during their working movements, that is, they will not be tilted objectionably with respect to the work.

From the foregoing description it is obvious that the present improvement is susceptible of considerable modification, both in the construction and arrangement of parts, without departure from the present invention, although the embodiment of the same herein shown and described is consider-- ed preferable.

Having thus set forth the nature of the invention, what I claim. herein is 1. In a feeding mechanism for sewing inachines, in combination, a driving shaft, a horizontally disposed main feed-bar at one side of said driving shaft, a horizontally disposed auxiliary feed-bar supported in dependently of the main feed-bar at the other side of said driving shaft, feed-dogs carried by said feed-bars, supporting fulcra for said feed-bars, supports for said fulcra and actuating means connected therewith for imparting to the feed-bars through their re spective fulcra endwise work-advancing movements, and means connected with said feed-bars for imparting thereto rising-andfalling movements.

2. In a feeding mechanism for sewing machines, in combination, a driving shaft, main and auxiliary feed-rockers disposed at opposite sides thereof, main and auxiliary feedbars fulcrnmed at substantially the same level upon their respective feed rockers, feeddogs carried by said feed-bars, and means for imparting work-advancing and risingand-falling movements to said feed-dogs.

3. In a feeding mechanism for sewing inachines, in combination, a driving shaft, main and auxiliary feed-rockers disposed upon opposite sides of said driving shaft, independently supported main and auxiliary feed-bars operatively connected respectively with said feed-rockers, a feed-dog carried by each of said feed-bars, means independent of the feed-rockers for imparting rising-andfalling movements to said feed-bars, and means for actuating said feedrockers differentially.

i. In a feeding mechanism for sewing machines, in combination, a driving shaft, main and auxiliary feedrockers disposed upon opposite sides of said driving shaft, main and auxiliary feed-bars fulcrumed respectively upon said feed-rockers, a feed-dog carried by each of said feed-bars, means for imparting rising-and-falling movements to said feed-bars, and means for actuating said feed-rockers, said means including a connection between said rockers for differentiat ng their work-advancing movements.

in a feeding mechanism for sewing machines, in combination, a driving shaft, a main feed-rocker disposed on one side of said driving shaft, an auxiliary feed-rocker disposed upon the other side of said driving shaft, a roclcshaft upon which said auxiliary feed-rocker is journaled, main and auxiliary feed-bars fulcrumed respectively actuating said feed-rockers, said means inupon said feed-rockers, feed-dogs carried eluding a connection between said rockers by said feed-bars, means for imparting risfor differentiating their Work-advancing 10 ing-and-falling movements to said main movements.

feed-bar, means including said rock-shaft In testimony whereof, I have signed my for imparting rising-and-falling movements name to this specification. y to said auxiliary feed-bar, and means for ANDREW B. CLAYTON. I 

